Astlib

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* Bug fix by upgrade to wcssubs-3.9.5; updated docs.

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* This version fixes astSED to work with numpy 1.18 and above.

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* This version adds a 'shim' that uses astropy.wcs for WCS coordinate conversions
(enabled by default).

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* No new features added; this version breaks compatibility with pyfits (which has
been depreciated by STScI) and Astropy is now a requirement. If you still
require a version that works with pyfits, please continue to use astLib 0.9.3.

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* A bug fix release, primarily for compatibility with numpy 1.12+ and pyfits 3.4.
No new features added.

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* Upgraded underlying wcssubs to version 3.8.7, and added a bug fix for repeat runs
of coord conversion encountered when using images with polynomial distortion
coefficients (thanks to Ralf Kotulla; this error not reproduced on Kubuntu).

* Some updates to avoid using deprecated features in pyfits (so now require
pyfits 3.3 or astropy 0.4) and matplotlib.

* Added zapKeywords option when creating WCS objects in astWCS - this can help in
dealing with some malformed FITS headers (the usual culprits are COMMENT or
HISTORY keywords with unprintable characters).

* Fixed an index bug in MAD, median that affected biweightScale, biweightLocation
calculations in astStats (small shift in values that ought to be insignificant in
to any result that relies on the use of the biweight).

* Some improvements in astCalc (using scipy for integration, tl2z and tz2z now throw
exceptions for negative values).